简体中文版
LSAW pipe, or Longitudinal Submerged Arc Welded pipe, is a welded steel pipe made from steel plate. The plate is formed into a cylindrical pipe section, and the joint between its longitudinal edges is welded by the submerged arc welding process.
The finished pipe has a straight longitudinal weld seam running parallel to the pipe axis. This welded construction distinguishes LSAW pipe from seamless pipe and from spiral welded pipe, where the weld follows a helical path.
LSAW pipe is generally associated with large-diameter welded pipe, with the pipe grade, dimensions, wall thickness, and applicable specification determined by the project or product requirements.
In simple terms: LSAW pipe is a steel-plate-based welded pipe with a longitudinal seam produced by submerged arc welding.
LSAW stands for Longitudinal Submerged Arc Welded.
- Longitudinal refers to the direction of the weld seam, which runs along the length of the pipe.
- Submerged Arc Welded refers to the welding process used to join the longitudinal seam.
The term therefore identifies the weld orientation and welding method used in the pipe.
An LSAW pipe starts as a flat steel plate and is formed into a cylindrical pipe section. The two longitudinal edges of the formed plate meet along the pipe length and are joined to create the longitudinal weld seam.
Steel Plate → Formed Pipe Section → Longitudinal Edges → Welded Seam
The resulting pipe has a continuous cylindrical body with one main longitudinal seam running parallel to the pipe axis. The seam location, weld profile, pipe diameter, and wall thickness are part of the finished pipe geometry and are controlled against the applicable product specification.
| Structural Part | Description |
|---|---|
| Pipe Body | The cylindrical section formed from steel plate. |
| Longitudinal Edges | The two plate edges brought together during pipe forming. |
| Longitudinal Weld Seam | The joint running parallel to the pipe axis and joining the formed plate into a pipe. |
| Pipe Axis | The centerline running through the length of the pipe; the LSAW seam follows this direction. |
| Wall Thickness | The thickness of the formed steel plate, specified according to the required pipe dimensions and service requirements. |
The UOE and JCOE routes use different plate-forming sequences to produce the cylindrical pipe section. They do not change the basic structural definition of LSAW pipe: the finished pipe has a longitudinal seam produced by submerged arc welding.
Detailed forming sequences, welding procedures, expansion, testing, and inspection are covered in the LSAW Manufacturing Process guide.
Q1. Is LSAW pipe welded or seamless?
LSAW pipe is a welded steel pipe with a longitudinal seam joined by submerged arc welding.
Q2. Is LSAW the same as SAW?
No. LSAW refers to the pipe and its longitudinal weld configuration, while SAW refers to the submerged arc welding process used to join the seam.
Q3. Are UOE and JCOE different types of LSAW pipe?
No. UOE and JCOE are pipe-forming methods used to produce LSAW pipe. They describe different forming routes rather than different pipe materials or standards.
Q4. What is the basic difference between LSAW and SSAW?
LSAW has a longitudinal weld seam, while SSAW has a spiral weld seam. The two pipe types use different forming arrangements.
| Technical Topic | Related Guide |
|---|---|
| Dimensions | LSAW Pipe Size Chart |
| Weight | LSAW Pipe Weight Chart |
| Manufacturing | LSAW Manufacturing Process |
| API 5L | API 5L LSAW Pipe: PSL1 vs PSL2 |
| Applications | LSAW Pipe Applications |
| LSAW vs SSAW | LSAW vs SSAW Pipe |
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